<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>vertical-align</title>
    <style>
        p{
            background-color: fuchsia;
            line-height: 25px;
        }
        span{
            background-color: white;
            vertical-align: bottom;
        }
    </style>
</head>
<body>
<p>X<span>X</span></p>
</body>
</html>